I smoked a joint in a couple of my dreams.
Once in a ND in which I felt high.
And the other time at a LD to test my feelings, I have then come up with the obvious conclusion that taking drugs in dreams is simply a trick to fool your SC.
The pill you take on the dream, the joint you smoke, the whiskey you drink, whatever… theyre not really drugs, and even if they were, you arent in your physical body —> you dont have a physical brain to be altered by the drugs. Taking drugs in the dream is just a method to let your SC know you wanna feel this or that way.
In my LD, at first I spawned a joint and after I smoked it, I felt very high, it was very very real, but after a couple of minutes when I started doing different things and I forgot about it, it kinda vanished until I remembered that I smoked a joint and then I felt high again, then I realized that my mind is controlling it and not the joint and then I started shifting between different kinds of moods to see how real it will feel,
the better imagination you have and the more you are familiar with the drug you are trying to “take”, the more real it will be. You can also of course just try to alter you consciousness not into a certain drug pattern but into any mind pattern you can think of.